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Process Control and Instrumentation

Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

100
95
63.2
87.5

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Process Control and Instrumentation
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

nRT/V
nRT/P
V/nRT
p/nRT

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Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Τds + 1
Eτds
1/(τds + 1)
E-τds

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Process Control and Instrumentation
__________ thermometer can not measure sub-zero (< 0° C) temperature,

Vapor pressure
Resistance
Mercury in glass
Bimetallic

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Process Control and Instrumentation
Composition of natural gas is determined by the

Haldane apparatus
Mass spectrometer
Both B and C
Chromatograph

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Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by

- ∞, π/2
-π/2, π/2
-π/2, 0
0, π/2

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